Transaction not yet indexed

521aWBCG9G7j2nKqi1u6F5xYXviY7fATBq6apPJBZsJshqoTDbbG75SecTvdfoZMpk2Lb1JVWCSogv2JZzsnHajD

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.